12720755 has 8 divisors (see below), whose sum is σ = 15382224. Its totient is φ = 10098400.

The previous prime is 12720751. The next prime is 12720767. The reversal of 12720755 is 55702721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12720755 - 2² = 12720751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9056 + ... + 10365.

It is an arithmetic number, because the mean of its divisors is an integer number (1922778).

Almost surely, 2^12720755 is an apocalyptic number.

12720755 is a deficient number, since it is larger than the sum of its proper divisors (2661469).

12720755 is a wasteful number, since it uses less digits than its factorization.

12720755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19557.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 12720755 is about 3566.6167441989. The cubic root of 12720755 is about 233.4376823521.

The spelling of 12720755 in words is "twelve million, seven hundred twenty thousand, seven hundred fifty-five".